Add [WillBeGarbageCollected] to Event.idl

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index cd45af635193d9286dd6ecc3bf9ae162eb5eec61..18b161e3f2c4e949a2a89373e22ea1b65f842bed 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -3729,9 +3729,9 @@ void Document::enqueueResizeEvent()
     ensureScriptedAnimationController().enqueuePerFrameEvent(event.release());
 }
 
-PassRefPtr<Event> Document::createEvent(const String& eventType, ExceptionState& exceptionState)
+PassRefPtrWillBeRawPtr<Event> Document::createEvent(const String& eventType, ExceptionState& exceptionState)
 {
-    RefPtr<Event> event = EventFactory::create(eventType);
+    RefPtrWillBeRawPtr<Event> event = EventFactory::create(eventType);
     if (event)
         return event.release();
 
@@ -3739,7 +3739,7 @@ PassRefPtr<Event> Document::createEvent(const String& eventType, ExceptionState&
     return nullptr;
 }
 
-PassRefPtr<Event> Document::createEvent(ExceptionState& exceptionState)
+PassRefPtrWillBeRawPtr<Event> Document::createEvent(ExceptionState& exceptionState)
 {
     if (!isSVGDocument()) {
         exceptionState.throwTypeError(ExceptionMessages::notEnoughArguments(1, 0));